| /* |
| * CDDL HEADER START |
| * |
| * The contents of this file are subject to the terms of the |
| * Common Development and Distribution License (the "License"). |
| * You may not use this file except in compliance with the License. |
| * |
| * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE |
| * or http://www.opensolaris.org/os/licensing. |
| * See the License for the specific language governing permissions |
| * and limitations under the License. |
| * |
| * When distributing Covered Code, include this CDDL HEADER in each |
| * file and include the License file at usr/src/OPENSOLARIS.LICENSE. |
| * If applicable, add the following below this CDDL HEADER, with the |
| * fields enclosed by brackets "[]" replaced with your own identifying |
| * information: Portions Copyright [yyyy] [name of copyright owner] |
| * |
| * CDDL HEADER END |
| */ |
| |
| /* |
| * Copyright (C) 2011 Lawrence Livermore National Security, LLC. |
| */ |
| |
| #ifndef _ZFS_DCACHE_H |
| #define _ZFS_DCACHE_H |
| |
| #include <linux/dcache.h> |
| |
| #define dname(dentry) ((char *)((dentry)->d_name.name)) |
| #define dlen(dentry) ((int)((dentry)->d_name.len)) |
| |
| #ifndef HAVE_D_MAKE_ROOT |
| #define d_make_root(inode) d_alloc_root(inode) |
| #endif /* HAVE_D_MAKE_ROOT */ |
| |
| #ifdef HAVE_DENTRY_D_U_ALIASES |
| #define d_alias d_u.d_alias |
| #endif |
| |
| /* |
| * Starting from Linux 5.13, flush_dcache_page() becomes an inline function |
| * and under some configurations, may indirectly referencing GPL-only |
| * cpu_feature_keys on powerpc. Override this function when it is detected |
| * being GPL-only. |
| */ |
| #if defined __powerpc__ && defined HAVE_FLUSH_DCACHE_PAGE_GPL_ONLY |
| #include <linux/simd_powerpc.h> |
| #define flush_dcache_page(page) do { \ |
| if (!cpu_has_feature(CPU_FTR_COHERENT_ICACHE) && \ |
| test_bit(PG_dcache_clean, &(page)->flags)) \ |
| clear_bit(PG_dcache_clean, &(page)->flags); \ |
| } while (0) |
| #endif |
| |
| /* |
| * 2.6.30 API change, |
| * The const keyword was added to the 'struct dentry_operations' in |
| * the dentry structure. To handle this we define an appropriate |
| * dentry_operations_t typedef which can be used. |
| */ |
| typedef const struct dentry_operations dentry_operations_t; |
| |
| /* |
| * 2.6.38 API addition, |
| * Added d_clear_d_op() helper function which clears some flags and the |
| * registered dentry->d_op table. This is required because d_set_d_op() |
| * issues a warning when the dentry operations table is already set. |
| * For the .zfs control directory to work properly we must be able to |
| * override the default operations table and register custom .d_automount |
| * and .d_revalidate callbacks. |
| */ |
| static inline void |
| d_clear_d_op(struct dentry *dentry) |
| { |
| dentry->d_op = NULL; |
| dentry->d_flags &= ~( |
| DCACHE_OP_HASH | DCACHE_OP_COMPARE | |
| DCACHE_OP_REVALIDATE | DCACHE_OP_DELETE); |
| } |
| |
| /* |
| * Walk and invalidate all dentry aliases of an inode |
| * unless it's a mountpoint |
| */ |
| static inline void |
| zpl_d_drop_aliases(struct inode *inode) |
| { |
| struct dentry *dentry; |
| spin_lock(&inode->i_lock); |
| hlist_for_each_entry(dentry, &inode->i_dentry, d_alias) { |
| if (!IS_ROOT(dentry) && !d_mountpoint(dentry) && |
| (dentry->d_inode == inode)) { |
| d_drop(dentry); |
| } |
| } |
| spin_unlock(&inode->i_lock); |
| } |
| #endif /* _ZFS_DCACHE_H */ |
